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Solar electric systems are in many cases economically superior to conventional power systems. The operating costs are low because solar electricity needs very little maintenance, very few spare parts, and no fuel. There are no moving parts, so the system has a very long lifetime, and it is virtually maintenance-free.
Solar is a low-risk, high-return investment. No matter what size system you buy, or what percentage of your electric usage you offset, your, payback period will be relatively the same. It is all a matter of how much you can invest to hedge against rising energy costs.
Once your system is "paid back," you have $0 invested in your system, and a percentage of your electricity bill eliminated for decades.